Rainfall in Kalimpong
Kalimpong gets 76% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 2,440 mm, 18% above average (normal).
Month-wise rainfall in Kalimpong
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 5 mm | 0% |
| February | 16 mm | 1% |
| March | 46 mm | 2% |
| April | 96 mm | 5% |
| May | 212 mm | 10% |
| June | 378 mm | 18% |
| July | 481 mm | 23% |
| August | 399 mm | 19% |
| September | 321 mm | 16% |
| October | 101 mm | 5% |
| November | 7 mm | 0% |
| December | 3 mm | 0% |
Yearly rainfall in Kalimpong since 2006
Lighter bars are dry years, 20% or more below average (2006, 2007, 2008, 2009, 2012, 2014, 2015), when wells and borewells are drawn hardest. The last ten years averaged 67% more rain than the ten before.
What Kalimpong's rain is worth to a building
Every millimetre of rain on a square metre of roof is a litre of water. A 100 m² roof in Kalimpong sheds about 1,75,525 litres in an average year, most of it in four monsoon months. Sent into a recharge pit, it refills the ground instead of flooding the street.
Your building: how much can you recharge?
1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.
Frequently asked questions
What is the average annual rainfall in Kalimpong?
About 2,065 mm a year, averaged over 2006–2025 from NASA POWER satellite and weather-model data for the centre of the district. The wettest year in that time was 2020 (3,312 mm) and the driest was 2006 (1,202 mm).
Which month gets the most rain in Kalimpong?
July, with 481 mm in an average year, followed by August and June. December is the driest month (3 mm).
How much of Kalimpong's rain falls in the monsoon?
76% of a normal year's rain falls from June to September. 7 months average 50 mm or more.
How much did it rain in Kalimpong in 2025?
2,440 mm, which is 18% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Kalimpong increasing or decreasing?
The last 10 years averaged 67% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Kalimpong harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Kalimpong sheds about 1,75,525 litres in an average year: area × rainfall × 0.85 for splash and evaporation. Sent into a recharge pit, that refills the ground under the house instead of running into the drain.
Rainfall from NASA POWER (bias-corrected satellite and weather-model rainfall) at the centre of Kalimpong district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.